This work was performedaiming to evaluate the morphogenetic and structural characteristics of Andropogongayanus cv. Planaltina species submitted to three cutting heights (20, 27and 34 cm). The three cutting heights were allocated in experimental units (12m2) in a complete randomized block design with three replications.The cuts were done when the light interception by the sward reached 95%. Atthis moment, the sward height revealed itself constant with values close to50 cm. The lowest cutting height (20 cm) influenced negatively the final leafblade length, the number of live leaves, the leaf lifespan, the stem elongationrate and the tiller population density, and it influenced positively the phyllochronand the leaf senescence rate. Probably, cuts at 20 cm height caused a high decapitationand death of the tillers. The worst growth conditions in addition to the blossomof this specie occurred during fall resulted in higher stem elongation ratesand number of live leaves, and lower phyllochron, final leaf blade length, andleaf lifespan. The sward height can be used as a practical and efficient criterionin the management of andropogon grass. Under intermittent management conditions,the regrowth of andropogon grass must be interrupted when the sward reaches50 cm height, and the defoliation must be interrupted when the stubble heightis close to 27 cm.
